{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.6.1"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3b25b084eab473bb6009b8e3d03ba5ff10bb4891"
            }
          ],
          "repo": "https://github.com/xlnt-community/xlnt",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "A vulnerability was found in xlnt-community xlnt up to 1.6.1. This issue affects the function xlnt::detail::compound_document_istreambuf::xsgetn of the file source/detail/cryptography/compound_document.cpp of the component XLSX File Parser. Performing a manipulation results in out-of-bounds read. The attack is only possible with local access. The exploit has been made public and could be used. The patch is named 147. It is recommended to apply a patch to fix this issue.",
  "id": "CVE-2026-3663",
  "modified": "2026-03-15T21:46:33.507600744Z",
  "published": "2026-03-07T15:15:56.020Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/xlnt-community/xlnt/"
    },
    {
      "type": "ADVISORY",
      "url": "https://vuldb.com/?id.349552"
    },
    {
      "type": "ADVISORY",
      "url": "https://vuldb.com/?submit.764644"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/xlnt-community/xlnt/issues/139"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/xlnt-community/xlnt/pull/147"
    },
    {
      "type": "REPORT",
      "url": "https://vuldb.com/?ctiid.349552"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/oneafter/0128/blob/main/xl3/repro"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}